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Corolla 5-lobed, salver-form; tube curved, bent or straight, of ten covered with stipitate glands, throat bearded; limb bilabiate, zygomorphic, lower lip 3-lobed.
Inflorescence terminally spicate or racemose, or flowers solitary-axillary or supra-axillary, pedicellate to sessile or subsessile.
Annual or perennial herbs or small shrubs with tuberous or elongated rhizomes; stems procumbent, ascending or erect.
Stamens 4, didynamous; filaments inserted in corolla tube, unilaterally bearded; anthers unithecal.
Bracteoles present Or absent, where present inserted on pedicel or adnate to base of calyx tube.
Ovary bilocular, variable, compressed or not; ovules numerous.
Calyx 4–5 lobed; tube ridged; lobes equal or subequal.
Fruit a capsule or berry, variable in shape.
Bracts leaf-like.
Seeds numerous.
